Plan sifting machine



Apr. 17, 1923. I 1,452,290

' H. CONRAD PLAN SIFTING MACHINE Filed Nov. 16 1921 {3 .4 r F, a

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UNITED STATES HERMANN' CONRAD, OF lNEU'STADT, HAARDT, GERMANY.

PLAN SIFTING MACHINE.

Applicationfiled Ilovember 16, 1921. Serial No. 515,727.

To all whom it may concern:

Be it known that I, HERMANN CONRAD, a citizen of the German Republic,and residing at Neustadt, Haardt, Germany, have invented certain new anduseful Improvements in Plan sifting Machines, of which the following isa specification- This invention relates to an improved freelyoscillating plan sifting machine having two superposed sieve-boxes and adriving-disc arranged horizontally between the latter, and its noveltyconsists in connecting said driving-disc by means of crank-pins to saidsieve-boxes and balancing it around its oscillatory centre, that is thegravity centre of the whole driving-disc, behind centre lying exactly inthe middle between said crank-pins, one of said crank-pins lying in thecentral axis of said driving-disc and the other at 180 theretorelatively to said oscillatory centre. I

The accompanying drawing shows the improvement Figs. 1 and 2 arerespectively a side View and a front View of the plan sifting inachine,

Fig. 3 is a plan view of the same,

Fig. 4- is a vertical section through the driving-disc mechanism,

Fig. 5 is a plan View of the driving-disc.

The freely oscillating plan sifting ma chine, Without a separatefiy-weight, comprises two sieve-boxes c and d suspended above oneanother from pendulums a and Z) in such a manner that the uppersieve-box c suspended from the pendulums a can osci1- late between thependulums Z) of the lower sieve-box d, the two sieve-boxes being incommunication with one another through flexible tubes.

A crank-disc f arranged horizontally between said sieve-boxes andforming at the same time a driving-pulley, efiects the oscil' lation ofsaid sieve-boxes by the attachment of its loose crank-pins it, i to thecentre of the bottom of the upper sieve-box and to the centre of the topof the lower sieve-box respectively, one of said crank-pins lying in thecentral axis of said crank-disc and the other at thereto relatively tothe oscillatory centre 70, the crank-disc being balanced oreccentrically weighted around said oscillatory centre and capable ofbeing driven by means of a belt a guided over rollers m which aremounted in brackets Z suspended from the upper sieve-box 0.

The'particular advantage of the improvement lies in the fact that, whileomitting a separate flyvveight used with the hitherto known plansiftingmachines and necessitating a specially strong frame, theoscillation of'the sieve-boxes is attained in a reliable manner and in auniform way simply by means of a crank-disc arranged between saidsieve-boxes and the crank-pins of which are attached to the latter,whereby the utility of the machine is increased, its construction issimplified, and costs are saved.

l/Vhat I claim, is

In a plan sifting machine, in combination, two oscillatory sieve-boxes,a belt-driven crank-disc horizontally arranged between the latter andbalanced around its oscillatory centre, and crank-pins on said crankdiscattached to said sieve-boxes, one of said crank-pins lying in thecentral axis of said crank-disc and the other at 180 thereto relativelyto said oscillatory centre, substantially as and for the purpose setforth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses. HERMANN CONRAD.

Witnesses:

NIKOLAUS GLAz, MICHAEL Heme.

